What caused emissions code P0302 on 01 mercury mystique?

Answer 1

misfiring on cylinder #2 ,usually you can fix with a new set of spark plug wires,it's important the use of a dielectric tune up grease,coat inside of spark plug boot with a layer of dielectric grease before snap boot onto plug,making sure fit is tight

Answer 2

Emissions code P0302 indicates a misfire in cylinder 2 of the engine. Common causes include faulty spark plugs, ignition coils, fuel injectors, or a vacuum leak. To diagnose and fix the issue, it's recommended to check and replace these components as needed.